.search_history{
    width: 150px;
    height: 200px;
    display: block;
    background-color: pink;
    margin: 0 auto;
}

.search_history_hidden{
    width: 150px;
    height: 200px;
    display: none;
    background-color: pink;
}

.dv{
    width: 500px;
    height: 500px;
    border: 1px solid black;
    margin: 0 auto
}

.history-no
{
    color: blue
}

.history-bgc
{
    background-color: green;
}

.button-show {
    display: block;
}

.button-off
{
    display: none;
}